Accelerated atherosclerosis in patients with systemic lupus erythematosus: a review of the causes and possible prevention

ABSTRACT

Hong Kong Med J 2002;8:26-32 | Number 1, February 2002
REVIEW ARTICLE
Accelerated atherosclerosis in patients with systemic lupus erythematosus: a review of the causes and possible prevention
GN Thomas, LS Tam, B Tomlinson, EK Li
Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
 
 
Systemic lupus erythematosus is an autoimmune disorder affecting multiple organ systems. Patients with systemic lupus erythematosus exhibit a bimodal pattern of mortality, with those who have had the disease for 5 to 10 years being at increased risk of cardiovascular disease, particularly myocardial infarction. Elevated levels of conventional cardiovascular risk factors promote vascular damage resulting in impairment of normal endothelial function. In addition, autoantibodies directed against oxidised lipoproteins, along with chronic secretion of inflammatory cytokines and suppression of fibrinolytic parameters, are thought to increase atherogenesis. Treatment with corticosteroids may also contribute to the accelerated atherosclerosis observed in these patients. This review discusses the accentuated relationship between conventional cardiovascular risk factors, systemic lupus erythematosus–induced inflammatory changes and the early stages of atherogenesis and how careful monitoring of risk factors and use of appropriate therapies may reduce the progression of atheroma development in patients with systemic lupus erythematosus.
 
Key words: Arteriosclerosis; Cardiovascular diseases; Hong Kong; Lupus erythematosus, systemic
 
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Mild iodine deficiency and thyroid disorders in Hong Kong

ABSTRACT

Hong Kong Med J 2001;7:414-20 | Number 4, December 2001
REVIEW ARTICLE
Mild iodine deficiency and thyroid disorders in Hong Kong
JW Kung, TT Lao, MT Chau, SCF Tam, LCK Low, AWC Kung
Department of Medicine, The University of Hong Kong, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong
 
 
OBJECTIVES. To review evidence of iodine deficiency and clinical thyroid disorders in Hong Kong.
 
DATA SOURCES. Publications on local dietary iodine intake, the iodine content of local food items, and clinical thyroid problems in the Hong Kong population.
 
DATA EXTRACTION. Data was extracted and evaluated independently by the authors.
 
DATA SYNTHESIS. Iodine is an essential nutrient. Iodine deficiency can lead to goitre, hypothyroidism, mental deficiency, and impaired growth. It is now appreciated that determination of goitre incidence in children alone may grossly underestimate the problem of iodine deficiency in a population. In total, the evidence indicates that iodine deficiency exists in Hong Kong, leading to clinical problems of transient neonatal hypothyroidism, goitrogenesis, and thyroid disorders in pregnant women and neonates, as well as thyroid dysfunction in the elderly.
 
CONCLUSION. A supplementation programme aimed at a relatively uniform iodine intake is recommended to avoid deficient or excessive iodine intake in subpopulations.
 
Key words: Goiter; Hypothyroidism; Iodine, deficiency; Pregnancy; Thyroid diseases
 
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Mechanisms of cell death and treatment prospects in motor neuron disease

ABSTRACT

Hong Kong Med J 2001;7:267-80 | Number 3, September 2001
REVIEW ARTICLE
Mechanisms of cell death and treatment prospects in motor neuron disease
PJ Shaw
Department of Neurology, University of Sheffield and Royal Hallamshire Hospital, Beech Hill Road, Sheffield, United Kingdom
 
 
Scientific evidence is emerging to indicate that motor neuron injury in motor neuron disease may reflect a complex interplay between genetic factors, oxidative stress, and imbalance of the glutamatergic excitatory control of motor neurons, which may result in damage to critical target proteins and organelles. The relative importance of these factors is likely to vary in different subgroups of patients. Protein aggregation may play a role in some forms of motor neuron injury, and the eventual demise of motor neurons may occur by a programmed cell death pathway. Advances in symptomatic therapy for patients with motor neuron disease include the development of specialist clinics, with input from multidisciplinary teams, as well as hospice care in the late stages of the disease. A number of recent therapeutic trials of potential neuroprotective drugs have been conducted, including antiglutamate, antioxidant, and neurotrophic agents. To date, only the antiglutamate agent riluzole has been shown to reproducibly prolong the survival of patients with motor neuron disease. Future therapy in motor neuron disease is likely to include a ÔcocktailÕ of neuroprotective compounds to interfere with several molecular pathway that lead to neuronal injury. In using therapeutic strategies aimed towards retarding or arresting motor neuron disease, close attention will need to be paid to quality of life issues.
 
Key words: Apoptosis; Mitochondrial dysfunction; Motor neuron disease; Neuroprotein; Oxidative stress
 
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Invasive disease due to Mucorales: a case report and review of the literature

ABSTRACT

Hong Kong Med J 2001;7:180-8 | Number 2, June 2001
REVIEW ARTICLE
Invasive disease due to Mucorales: a case report and review of the literature
CK Yeung, VCC Cheng, AKW Lie, KY Yuen
Division of Haematology, Department of Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong
 
 
OBJECTIVE. To review the mycology, pathogenesis, clinical characteristics, investigations, and treatment modalities of mucormycosis.
 
DATA SOURCES. A local case of mucormycosis; MEDLINE and non-MEDLINE search of the literature.
 
STUDY SELECTION. Key words for the literature search were 'mucormycosis' and 'Mucorales'; all available years of study were reviewed.
 
DATA EXTRACTION. Original articles, review papers, meta-analyses, and relevant book chapters were reviewed.
 
DATA SYNTHESIS. Mucormycosis is a fungal infection that is rare but increasingly recognised in the growing population of immunocompromised patients. It is caused by saprophytic non-septate hyphae of the order Mucorales. The pulmonary and disseminated forms commonly occur in patients with haematological malignancy, especially acute leukaemia and lymphoma, and those receiving treatment with immunosuppressive effects. The rhinocerebral form is more prevalent in patients with diabetes mellitus, particularly those with the complication of diabetic ketoacidosis. The use of amphotericin B combined with surgery remains the mainstay of treatment. The prognosis largely depends on prompt correction of the underlying risk factors. New strategies to combat this life-threatening infection will result from better understanding of its pathogenesis.
 
CONCLUSION. A high index of suspicion is needed, in appropriate clinical settings, to diagnose and aggressively treat this infection in view of the high mortality rate for susceptible patients.
 
Key words: Amphotericin B; Diabetes mellitus; Immunosuppression; Leukemia; Mucormycosis
 
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The shortage of solid organs for transplantation in Hong Kong: part of a worldwide problem

ABSTRACT

Hong Kong Med J 2000;6:399-408 | Number 4, December 2000
REVIEW ARTICLE
The shortage of solid organs for transplantation in Hong Kong: part of a worldwide problem
TA Buckley
Department of Anaesthesia and Intensive Care, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
 
 
OBJECTIVE. To review the factors involved in determining the availability of solid organs for transplantation in Hong Kong and to identify methods that have been used in other countries to increase organ donation rates.
 
DATA SOURCES. Medline and non-Medline search of the relevant English literature, local data, and personal experience.
 
STUDY SELECTION. Articles describing approaches to solid organ procurement for transplantation.
 
DATA EXTRACTION. Data were extracted and analysed by the author.
 
DATA SYNTHESIS. There is a severe shortage of solid organ donors in Hong Kong, which is compounded by an ever-increasing pool of potential recipients. Limited local data suggest public support for organ donation. The most common reason for objection to organ donation is a lack of knowledge of the wishes of the deceased. Despite the implementation of numerous legislative models worldwide, none has been shown to be superior as a facilitator of organ donation. Despite the lack of legislation in Hong Kong, the medical profession has adopted the expressed consent model. The use of non-heart-beating donors, elective ventilation of futile cases, and financial incentives pose significant ethical and legal barriers as well as resource implications for intensive care.
 
CONCLUSION. Greater effort should be directed through public education at the importance of telling one's family what one's wishes are concerning organ donation. More information is required in Hong Kong as to why families agree to organ donation and how best to approach families to request organ donation.
 
Key words: Brain death; Legislation, medical; Organ procurement; Organ transplantation; Public opinion
 
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Air pollution and health

ABSTRACT

Hong Kong Med J 2000;6:390-8 | Number 4, December 2000
REVIEW ARTICLE
Air pollution and health
MNW Chan-Yeung
Department of Medicine, The University of Hong Kong, Queen Mary Hospital, Hong Kong
 
 
OBJECTIVE. To review the effects of air pollution on health, with special reference to data obtained locally in Hong Kong.
 
DATA SOURCES. Medline literature search (1960-1999), websites of the World Health Organization and Environmental Protection Department, Hong Kong, and a report from the Sub-Working Group on the Review of Hong Kong's Air Quality Objectives, 1999.
 
STUDY SELECTION. Key words for the literature search were 'air pollution' and 'health'.
 
DATA EXTRACTION. The author reviewed relevant information and data.
 
DATA SYNTHESIS. In many parts of the world and in Hong Kong, air pollution is associated with increased mortality and morbidity rates, as reflected by increased hospital admissions and doctor visits, not only for respiratory illnesses but also for cardiovascular illnesses. Some studies have found that air pollution is also associated with an increase in respiratory symptoms in lower lung function in children. In Hong Kong, air pollution is mostly because of traffic emissions. During the past decade, the annual mean levels of respirable suspended particulates and oxides of nitrogen and ozone have increased and exceeded the air quality objectives set by the Environmental Protection Department of Hong Kong.
 
CONCLUSION. The medical profession should be concerned about the health effects of air pollution and should call for action to reduce the current levels of air pollution to an acceptable level.
 
Key words: Air pollution; Environmental exposure; Health status; Lung diseases/epidemiology; Risk factors
 
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Evaluation of the benefits and risks of hormone replacement therapy

ABSTRACT

Hong Kong Med J 2000;6:381-9 | Number 4, December 2000
REVIEW ARTICLE
Evaluation of the benefits and risks of hormone replacement therapy
GKH Au
Department of Clinical Oncology, Queen Mary Hospital, Pokfulam, Hong Kong
 
 
OBJECTIVE. To review recent data on outcome of hormone replacement therapy in postmenopausal women.
 
DATA SOURCES. Medline search of the literature and local data.
 
STUDY SELECTION. Data on efficacy of hormone replacement and its unwanted side effects were examined.
 
DATA EXTRACTION. Statistical data were extracted from published studies and meta-analyses.
 
DATA SYNTHESIS. Statistical data came mainly from observational studies and not from randomised trials, and were therefore subject to bias. Overall, it would appear reasonable to say that risks for breast and endometrial cancers, as well as thromboembolism, were increased, while the risks for cardiovascular death and osteoporotic fractures were reduced by hormone replacement therapy. Locally, for every 100,000 women treated for 3 to 5 years, there may be 22 fewer cardiac deaths, 10 to 20 more cases of breast cancer, seven more cases of endometrial cancer, 10 more cases of thromboembolic disease, and slightly fewer cases of osteoporotic fracture.
 
CONCLUSION. Reported data and risk estimates have been derived predominantly from data on white Caucasian women. Their baseline risk may be different from those of Chinese women. A low baseline risk in the local population may influence treatment results, and large-scale randomised trials are needed to give a definitive answer.
 
Key words: Estrogen replacement therapy; Estrogens/conjugated; Menopause/drug effects; Risk factors
 
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Undergraduate medical education: comparison of problem-based learning and conventional teaching

ABSTRACT

Hong Kong Med J 2000;6:301-6 | Number 3, September 2000
REVIEW ARTICLE
Undergraduate medical education: comparison of problem-based learning and conventional teaching
PL Nandi, JNF Chan, CPK Chan, P Chan, LPK Chan
Department of Surgery, University of Hong Kong Medical Centre, Queen Mary Hospital, Pokfulam, Hong Kong
 
 
OBJECTIVE. To review the literature on studies comparing all aspects of problem-based learning with the conventional mode of teaching.
 
DATA SOURCES. Medline literature search (1980 through 1999) and the references cited in retrieved articles.
 
DATA SELECTION. Studies and meta-analyses that compared the newer problem-based learning curriculum and the conventional lecture-based mode of teaching undergraduate medical students. Areas of comparison included the academic process; programme evaluation; academic achievement; graduates' performance, specialty choices, and practice characteristics; and the attitude of students and teachers towards the programmes.
 
DATA EXTRACTION. Data were extracted independently by multiple authors.
 
DATA SYNTHESIS. Students of the problem-based learning curriculum found learning to be "more stimulating and more humane" and "engaging, difficult, and useful", whereas students of the conventional curriculum found learning to be "non-relevant, passive, and boring". Students who used the problem-based learning method showed better interpersonal skills and psychosocial knowledge, as well as a better attitude towards patients. Students using the conventional model, however, performed better in basic science examinations. Teachers tended to enjoy teaching the newer curriculum. Although the two curricula encourage different ways of learning, there is no convincing evidence of improved learning using the problem-based learning curriculum.
 
CONCLUSION. A combination of both the conventional and newer curricula may provide the most effective training for undergraduate medical students.
 
Key words: Attitudes of health personnel; Curriculum; Education, medical, undergraduate; Evaluation studies; Problem solving; Teaching/methods
 
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Single foetal death in twin pregnancies: review of the maternal and neonatal outcomes and management

ABSTRACT

Hong Kong Med J 2000;6:293-300 | Number 3, September 2000
REVIEW ARTICLE
Single foetal death in twin pregnancies: review of the maternal and neonatal outcomes and management
HHN Woo, SY Sin, LCH Tang
Department of Obstetrics and Gynaecology, Kwong Wah Hospital, 25 Waterloo Road, Kowloon, Hong Kong
 
 
OBJECTIVE. To review the maternal and neonatal outcomes, and management of single foetal death in twin pregnancies.
 
DATA SOURCES. Medline literature search (1950 to 1999) and hospital audit of single antepartum foetal deaths in twin pregnancy from 1993 through 1997.
 
DATA SELECTION. Key words for literature search: twin pregnancy/pregnancies; single fetal death/demise.
 
DATA EXTRACTION. Data were extracted and reviewed independently by the authors.
 
DATA SYNTHESIS. During the study period, 182 (0.76%) of 23,804 deliveries involved twin pregnancies. Seven (3.8%) of the twin pregnancies were complicated by the death of one foetus. Single foetal death in a twin pregnancy in the late second and third trimesters is associated with significant morbidity and mortality in the surviving co-twin, especially in a pregnancy involving monochorionic twins. Management should be individualised; conservative management is preferred by most obstetricians.
 
CONCLUSION. Single foetal death in twin pregnancies should be managed in a tertiary referral centre, where intensive foetal surveillance and adequate neonatal support are available. A multidisciplinary approach should be adopted.
 
Key words: Fetal death/etiology; Pregnancy, multiple; Pregnancy outcome; Twins
 
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Oral care for children with leukaemia

ABSTRACT

Hong Kong Med J 2000;6:203-8 | Number 2, June 2000
REVIEW ARTICLE
Oral care for children with leukaemia
SY Cho, AC Cheng, MCK Cheng
Tuen Mun School Dental Clinic, Department of Health, 16 Tsun Wen Road, Tuen Mun, Hong Kong
 
 
OBJECTIVES. To review the oral care regimens for children with acute leukaemia, and to present an easy-to-follow oral care protocol for those affected children.
 
DATA SOURCES. Medline and non-Medline search of the literature; local data; and personal experience.
 
STUDY SELECTION. Articles containing supportive scientific evidence were selected.
 
DATA EXTRACTION. Data were extracted and reviewed independently by the authors.
 
DATA SYNTHESIS. Cancer is an uncommon disease in children, yet it is second only to accidents as a cause of death for children in many countries. Acute leukaemia is the most common type of malignancy encountered in children. The disease and its treatment can directly or indirectly affect the child's oral health and dental development. Any existing lesions that might have normally been dormant can also flare up and become life-threatening once the child is immunosuppressed. Proper oral care before, during, and after cancer therapy has been found to be effective in preventing and controlling such oral complications.
 
CONCLUSION. Proper oral care for children with leukaemia is critical. Long-term follow-up of these children is also necessary to monitor their dental and orofacial growth.
 
Key words: Child; Leukemia/therapy; Mouthwashes; Oral hygiene/methods
 
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